668.3 HP from Chev 377" !!!!!!
01-30-2005, 09:29 AM
#1
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668.3 HP from Chev 377" !!!!!! The dyno sheet from this Dart Alluminum Block engine. 10.8 compression, 18 deg Chapman 246 cly heads, titanium valves, comp cs254/260 R108 roller cam, .026/.028 valve lash, 93 octane, Penzoil 15w-40 mineral oil, Accel 416 plugs .040 gap, 1 7/8 headers, 750 Holley Carb. 668.3 Hp Non blower or turbo.
See link: http://community.webshots.com/photo/...33855104KcyjkN
Forgive my ignorance, but how is The builder of this engine (American Speed) getting these numbers, and nothing like it in this forum?
See link: http://community.webshots.com/photo/...33855104KcyjkN
Forgive my ignorance, but how is The builder of this engine (American Speed) getting these numbers, and nothing like it in this forum?
01-30-2005, 10:20 AM
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Originally Posted by BigPlanTransAm
its wierd lookin. i dont think its a vette... a kit car maybe?
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02-01-2005, 04:55 PM
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Originally Posted by Karlo
The dyno sheet from this Dart Alluminum Block engine. 10.8 compression, 18 deg Chapman 246 cly heads, titanium valves, comp cs254/260 R108 roller cam, .026/.028 valve lash, 93 octane, Penzoil 15w-40 mineral oil, Accel 416 plugs .040 gap, 1 7/8 headers, 750 Holley Carb. 668.3 Hp Non blower or turbo.
See link: http://community.webshots.com/photo/...33855104KcyjkN
Forgive my ignorance, but how is The builder of this engine (American Speed) getting these numbers, and nothing like it in this forum?
See link: http://community.webshots.com/photo/...33855104KcyjkN
Forgive my ignorance, but how is The builder of this engine (American Speed) getting these numbers, and nothing like it in this forum?
02-03-2005, 12:00 AM
#9
Those numbers aren't THAT different from the ones on the board. How many solid roller 260 degree cam sheetmetal intake 1 7/8 header'ed (rev'ed to the sky I would think) ls1's are here? Even if that is RWHP, I would imagine little/no drivetrain loss since there is no driveshaft in that vehicle...
02-04-2005, 04:20 PM
#10
The secret to that motor is the heads. Those 18 degree race heads will flow 350 CFM or so on the intake. Also, that cam is BIG. It wouldn't be streetable even by the standards of most of the lunatics on this board 
I'd also have to say that American Speed typically reports very high dyno numbers - about 5% or more up from the other dyno numbers you see on comparable builds. I seem to recall that American Speed uses a "pull-down" dyno technique which starts at high RPM and loads the engine down from there, which might account for their higher numbers.
I'd also have to say that American Speed typically reports very high dyno numbers - about 5% or more up from the other dyno numbers you see on comparable builds. I seem to recall that American Speed uses a "pull-down" dyno technique which starts at high RPM and loads the engine down from there, which might account for their higher numbers.
02-07-2005, 06:54 AM
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More than likely those ratings are at the flywheel which through a manaul would put it's rwhp between 547 to 567. I have full confidence that a 377ci LS1 based engine could put down those numbers fairly easily if built right, also I can guarantee that it will be much more streetable than the engine mentioned above.
-Sly
-Sly
